Name the elements present in hydrocarbons.

Explanation

**Step-by-Step Solution:**

1. **Definition of Hydrocarbons**: Hydrocarbons are organic compounds that consist exclusively of hydrogen (H) and carbon (C) atoms.

2. **Examples of Hydrocarbons**:
- **Alkanes**: These are saturated hydrocarbons. For example, ethane (C2H6) consists of 2 carbon atoms and 6 hydrogen atoms.
- **Alkenes**: These are unsaturated hydrocarbons with at least one double bond. For example, ethene (C2H4) has 2 carbon atoms and 4 hydrogen atoms.
- **Alkynes**: These are also unsaturated hydrocarbons but contain at least one triple bond. For example, ethyne (C2H2) has 2 carbon atoms and 2 hydrogen atoms.
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